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Mix the brown sugar, flour and salt in the top of a double boiler.
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Stir in the milk, add the butter and cook over simmering water, stirring, until thickened.
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Let cook 20 minutes, stirring occasionally.
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Beat 2 egg yolks.
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Temper them with a little of the hot mixture, then stir them into the pudding.
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Cook 5 minutes longer.
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Remove from heat.
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Add the vanilla, then pour into the prepared pie shell.
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Beat the egg whites and cream of tartar until stiff, beating in the sugar a little at a time to make a meringue.
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Spread on top of pudding and brown in a 350*F oven for about 10 minutes or until golden.